Sir Isaac Newton was one of the greatest scientists of all time, a thinker of extraordinary range and creativity who has left enduring legacies in mathematics and the natural sciences. In this volume a team of distinguished contributors examines the principal aspects of Newton's thought. They include not only his approach to space, time, mechanics, and universal gravity in Principia and his research in optics and mathematics, but also his lesser known clandestine investigations into alchemy, theology, and prophecy.